Injection Blow Molding Parison Cavity Temperature Control
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Solution Overview
Problem
The existing injection blow molding (IBM) process requires significant operator discretion and expertise, leading to high capital, operating, and maintenance costs due to the complexity of split parison molds with multiple water lines, which complicates temperature control and affects the efficiency of the molding process.
Innovation Solution
An injection blow molding system with shiftable die sets and independently coupled mold halves that regulate temperature through a unified heat transfer fluid system, minimizing operator intervention and simplifying mold design and maintenance by using a single temperature control unit for all heat transfer channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple individual thermolators are used to control water temperature at different locations in the parison mold, then temperature control precision is improved, but device complexity and operating costs increase
Solution Approach 1:
The mold is divided into multiple zones with water lines positioned at different locations (near the neck or body of the parison), allowing differential temperature control at specific regions while using a single thermolator to manage the overall temperature profile
Solution Approach 2:
The system changes the temperature parameter of water supplied to different water lines to achieve optimal temperature distribution across the mold, with the single thermolator adjusting water temperature to satisfy multiple zone requirements
2Manufacturing precision
If multiple individual thermolators are used for temperature control, then temperature regulation accuracy is improved, but operating costs and maintenance costs increase
Solution Approach 1:
Multiple temperature control functions that would traditionally require separate thermolators are merged into a single thermolator system, reducing the number of components and associated costs while maintaining the ability to control temperature at multiple water line locations
3Adaptability or versatility
If operator discretion is increased for adjusting water temperature, then adaptability to different molding conditions is improved, but productivity and efficiency decrease
Solution Approach 1:
The single thermolator system is configured to automatically provide appropriate temperature control to multiple water lines based on pre-determined parameters, eliminating the need for continuous operator intervention and manual adjustments while maintaining process adaptability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces operator discretion, lowers costs, and enhances the consistency and efficiency of the molding process by maintaining target temperatures across the parison cavity surfaces, resulting in improved production outcomes with reduced complexity and variability.
Implementation Method 1
The water lines may be supplied with water at different temperatures depending on the location of the water line relative to the neck or body of the parison being formed
Implementation Method 2
a unified heat transfer fluid system, minimizing operator intervention and simplifying mold design and maintenance by using a single temperature control unit for all heat transfer channels
Data Source
AI summary
An injection blow molding (IBM) system and method for forming a plurality of parisons and molded articles. The IBM system includes an injection station having two die sets and a plurality of first and second body mold halves each attached to a respective die set. Each of the first body mold halves has a corresponding second body mold half with which it cooperatively defines a cavity for forming the exterior shape of the body of one of the parisons. The individual, independent attachment of the body mold halves to the die sets allows easy individual replacement of faulty or worn molds. Further, such an attachment configuration also permits the body mold halves connected to a common die set to be spaced from one another, so as to reduce thermal expansion problems and ease dimensional tolerances required for the width of the body mold halves.